An active target placed on marine fishing net, isotropy radiates vertical polarized 2.45GHz microwave signal, EIR--22.8dBm. A pasive radar system placed on a boat to detect the active target's direction and position within 10km. The features of this system are: Phase Lock Loop(PLL) technical is introduced to generte frquency stable microwave signal. A special code address is embedded on every active target.
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